Panasonic CS-E18SD3UAW service manual - Page 81

H28 Outdoor Pipe Temperature Sensor Abnormality

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15.5.10 H28 (Outdoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions  During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors. Malfunction Caused  Faulty connector connection.  Faulty sensor.  Faulty PCB. Troubleshooting When abnormality indication starts again Check the connector connection: ● Turn off the power ● Check the connector connection Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component. NO Is the connector connection normal? YES Check the outdoor heat exchanger temperature sensor: ● Plug out connector from the outdoor unit PCB ● Measure the resistance of the outdoor heat exchanger temperature sensor Is the measured resistance of the outdoor heat exchanger NO temperature sensor matches the value specified in its characteristic chart? YES ● Connector poor contact ● Correct the connection ● Defect in outdoor heat exchanger temperature sensor ● Replace the outdoor heat exchanger temperature sensor ● Defect in outdoor unit PCB ● Replace the outdoor unit PCB Sensor (Thermistor) Characteristics 70 1 Outdoor Air Sensor 60 2 Outdoor Heat Exchanger Sensor 50 40 1 30 2 20 10 0 14 32 50 68 86 104 122 Temperature (ºF) Resistance (kΩ) 81

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81
15.5.10
H28 (Outdoor Pipe Temperature Sensor Abnormality)
Malfunction Decision Conditions
During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature
sensor are used to determine sensor errors.
Malfunction Caused
Faulty connector connection.
Faulty sensor.
Faulty PCB.
Troubleshooting
When abnormality indication starts again
Check the outdoor heat exchanger temperature sensor:
●
Plug out connector from the outdoor unit PCB
●
Measure the resistance of the outdoor heat exchanger
temperature sensor
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Is the measured resistance of the outdoor heat exchanger
temperature sensor matches the value specified in its
characteristic chart?
●
●
●
Defect in outdoor unit PCB
●
Replace the outdoor unit PCB
Check the connector connection:
●
Turn off the power
●
Check the connector connection
Is the connector connection normal?
YES
●
Connector poor contact
●
Correct the connection
NO
NO
YES
Defect in outdoor heat exchanger
temperature sensor
Replace the outdoor heat exchanger
temperature sensor
Sensor (Thermistor)
Characteristics
70
60
50
Resistance (kΩ)
Temperature (ºF)
40
30
20
10
0
1
Outdoor Air Sensor
2
Outdoor Heat Exchanger
Sensor
2
1
Caution
14
32
50
68
86
104
122